Metal holdfast



Jan. 13, 193i. HIM. 'BATEMAN METAL HOLDFAST Filed Feb. 5, 1930 A 'I'T'ORNEYS.

Patentecl Jan. 13, 1931 UNITE TATES f HARRY MAURICE BA'IEMAN, or BURwoon, AUsrRAnIAQNE sour-n wAn s Y Y METAL HoLnrAsr 3 Application. filed. February '5, 1930, Serial No. 426,170, and in Australia December 5,1929.

. This invention relates to friction grips of the type in which one arm of the grip is forced into close contact with the material I to he held, and is adapted for use in construc- 5 tional metal work to prevent movement in one d rection of a plate, glrder, beam, or

rail, and is particularly adapted toprevent creep of rails on railway lines.

The invention comprises the use offiat or of angle steel pieces and. of U shaped bars of suitable cross section which pass throughhol'es'formed in the steel pieces and preferably spaced so thatthe distance between adjacentedges ofthe holes is less than the width of the material to be held. The bars are adapted to be partially rotated into grippingbar.

Fig. 5 is a perspective view of a fiat steel piece and U bars.

The upper horizontal flange 10 of an angle steel piece, which is of greater lengththan the width of the base of a rail 11, is provided I with spaced holes 12 on each side of the rail positioned so that the rail lies over a por tion of each hole. 7

A U shaped bar 13 of slightly smaller diameter' than a hole 12 is adapted to be inserted in each hole and faces 14 are formed on the inner sides of the ends of the arms of the bar to increase the area of contact of the bar with the rail and angle steel piece 10.

The upper arm 15 of thebar may be of great or length than the lower arm 16.

- In application an angle steel piece is placed under thejrail so that each hole 12 is partly under the base of the rail and the vertical flange 17 of the angle piece is in contact with i the vertical face of a sleeper 18. A U'bar is inserted in each hole 12 with the arms 15, 16 projecting in the direction opposite to that of the normal creep of the rail. The upper arm 15 of each bar is then pushed inwards towards the web 19 oftherail to grip the sloping face20 of the foot flange} While the arm 15 is being swung into position the elbowof each bar travels outwards in the hole 1 2.t0

'makeiclose contact with the angle piece, and 5' the lower arm 16 islclrawnup against the lower face of the flange 10 of the'angle piece; which is thus firmly clamped to the rail.

Any tendency, of the rail to move forward or creep increases the grip of'the U 5" bars on the rail and the forward pressure is v transmitted by the angle piece to the sleeper 18 so that creep is prevented. v V

Fora hundred pound rail each angle piece may be, approximatelynine inches in length '5 I with flanges two inches wide and three eighths of an inch in thickness. Inthis case a contact area of about eighteen square inches is made between each angle piece and a'sleeper. ,I The U bars maybe of about oneinch in diam '0? eter. V

For other classes of constructional metal work the angle steel piece may be replaced by a fiat steel piece 21 provided with spaced holes 12and U shaped bars; 1 7

The dimensions of the'steel piece and the diameter of the U bars may be varied for application todiiferent sections of rails, girders, beams,-and the like. r

I claim l v 1. A metal holdfast comprising a steel piece, spaced holes formed in the steel piece, and a U shaped steel bar adapted to be rotated in each hole.

2. A metal holdfast comprising a steel 5 piece, spaced holes formed in the steel piece,a- U shaped steel bar adapted to be rotated in each hole, and a'flat surfaceon the inner face 'on the end ofeach arm of the bars. e i I 3. A metal holdfast comprising an angle 9 steel piece, a' horizontal {flange forming one face of the angle pie'ce,spaced holes in the horizontal fiange and a U shaped bar of smaller diameter thanthe hole inserted in each hole and adapted to be rotated therein.

4:. A metal holdfast comprising an angle steel piece,'a horizontal flange forming one face of the angle piece, a vertical flange forming another face of the angle piece, spaced holes formed in the horizontalfiange, a U mo shaped steel bar adapted to be rotated in each hole and having its upper arm of greater length thanits lower arm, and a flat surface on the inner face of the outer end ofeach arm 5 of the bar. r

5. A metal holdfast comprising a steel piece, holes formed in the steel piece and spaced at. a distance less than the Width of the material to be held, and a U shaped steel bar 7 10 adapted to be rotated in each hole.

In testimony whereof I havesig ned my name to this specification.

- HARRY M; VBATEMAN. 

